Clutch



L. n. GlNDRAT.

CLUTCH.

APPLICATION FILED APR-2|. l9l5 REIIEVIED FEB. 0 |9l8.

Patented Aug. 26,1919.

' 2 SHEETS-SHEET I.

FT-'Z Swix/nto@ L. R. GINDRAT.

CLUTCH.

APPLICATION FILED APR. 2l. I9I5 RENEWED FEB. 8, IQIB.

1,314,260. PntentedAug. 26,1919.

2 SHEETS-SHEET 2. Jig

\\ 10a m L jy s iig @am @KW LM gllgi 7 y UNITED STATES PATENT OFFICE.

LOUIS R. GINDRAT, OF BALTIMORE, MARYLAND.

CLUTCH.

Specification of Letters Patent.

Application filed April 21, 1915, Serial No. 22,876. Renewed February 8, 1918. Serial No. 216,139.

`To all whom 'it may concern.'

-to insure certainty and safety in the operation of the clutch.

i The details and advantages of my invention will be clear from the accompanying drawing, in which,

Figure 1 is a side elevation, partly in section, of a clutch having my improvements applied thereto;

,.1 Fig. 2is a top plan view of the tripping pin and the rocker carrying the latch for i `tripping the pin;

Fig. 3 is a side elevation of the driven member of the clutch;

Fig. 4 is a development of said clutch v member;

Figs. 5 and 6 are front and side views,

of the rocker;

Figs. 7 and 8 are detail views of the rocker, latch and tripping pin, illustrating their operation, the rocker and its support being 'shown in section;

a side View of the latch; and,

Fig. 9 is is a section through the latch,

Fig. 10

Menthe une 10-.10 ofrig, 9,

Referring to the drawing, A indicates a clutch comprising a driving member 1, which is journaled upon a shaft 2, and a driven member 3, which is secured against rotation on said shaft by a suitable key 4,

but Vis movable longitudinally on the shaft into and out of engagement with the drivling member 1. The member 1 is shown connected to a fly Wheel 5, journaled upon the shaft-2 and provided with a driving pulley 6', by means of which the fly wheel and clutch member 1 may be' constantly driven. It will be understood that the clutch is ap plicableto various kinds of machinei and 5b the driving means will vary' in di erent machines, the ily wheel and pulley being shown merely for the purpose of illustrating a common driving attachment for the driving member of clutches of this kind.'

`The clutch member 3 is pressed toward the `out in its periphery and extending almost around the circumference of the member', this groove having its major portion 10 in a plane at right angles to the axis of the shaft, and having a cam portion 11, near one end, substantially parallel with the-faces 12 of the teeth 13 of said member, and this groove extending slightly beyond the cam, first in a direction parallel with the part 10, and then terminating in a part 14 offset toward the part 10. A suitable bearing or support 15, through which the shaft 2 extends, has an arm 15, which overhangs the driven clutch member, and in this arm is mounted a spring pressed tripping pin 16, one end of which normally engages the end 14 of the cam groove and holds the driven member out of engagement with the driving member of the clutch. The tripping pin extends through a suitable opening 17 in the supporting arm, and a spring 18, surrounding the pin, and bearing against a collar 19 thereon, norl'nally presses the pin toward the clutch member and holds it in the groove. It will be evident that if the pin is lifted out of the groove against the action of the spring, the driven clutch member 3 will be released and will be pro- 4 jected by its spring 7 into engagement with the driving clutch member l, and if the tripping pin is immediately released after being lifted out of the end 14 of the groove,

it will drop mto the opposite end 10l of the groove and, as the driven member is cared to be engaged by a latch Z), mounted in` a rocking or oscillatingarm c. As shown,

this oscillating arm is mounted on trunnions 20, extending through ears b on the arm 15a, and this rocker has an extension 21 to which ispivotally` connecteda rod 22, Vadapted to be depressed lby a suitable pedal againstthe'- action of a spring 23, which moves the rod upward when the pedal-`is released.. The rockencjhas'a slot 24; and a bore25,` meeting said slot, the bore and 'Y slot extending centrally through its lower end, adj acent,'andl at right'angles to its axis.

VThel latch 5,: as shown in Figs; 9 and 10,

comprises a semi-cylindricalv body 26, havingy acollar 27 ato'r near one end, and having its Vopp'osite'end 28'beveled'or inclined as Vshown'. Immediately at the rear Voit' the inclined end` of the latchfis' a stop 29V which Y Y projects at right angles to the body of the latch. This latch Y toward thetripping pin or bolt bya spring 30, in thevbore 25, interposed between the collar 27 and an adjusting screw 31.V The collar fitting'Y against the end of the bore l Vse'r'v'e'sa's'a stopte limit the outward movement of" thellat'ch. It will be notedthat Vthe slot 24' is larger indiameter than the body of the latch, so that the latter may play laterally in the slot, to a limited extent, and

Y may bemoved back and'forth in the slot without being obstructed bythe projecting shoulder 29, if the latch is' raised as shown yin Fig. 8. When the latch is pressed forward to its fullest extent and depressed in the slot', as shown in Figs. 1 and 2, the shoulder 29 on the latch will lock against the lip 32, beneath the slot, and backward movement ofthe latch will be prevented. Above the forward end of the latch, the rocker has a projection 33, adapted'to extend vover the inclined surface of the head or shoulder of the tripping pin when the parts lare in their normalpositions, as shown inV Fig. 1, and to move out ofthe path of said head or shoulder when -the rocker is turnedin the direction of the arrow, Fig.V 7.

The operation is as follows. The latch b normally rests beneath the shoulder on the tripping pin, as shown in F ig. 1, being held.

- in thispo'sitionby the Vspring 23. In this the latch lifts the pin out of position also, the projection 33 on the rocker extends over theshoulder on' the pin. When the rod 22 is depressed, the vrocker Vmoves inthe direction of the arrow/,Fig 7, and

with the groove in the ciu-tch member, the latch finally passing', from under the shoulnormally pressed Vrocker is provided engagement der on the pin and permitting the-.spring 18 v to return the pin to the cam groove. Dur- Y ing this tripping movement of the rocker, it

will bel noted that the latch I) is locked against backward movement by the shoulder 29 engaging the lip 32, so that it is impos-v siblefor the pin to be tripped prematurely by backward slipping of the latch, and the pin: will necessarilybeY carried out of the groove at each complete tripping movement of the rocker.V It will be noted also that duringthis tripping movement, the; projection'33 on the rocker-moves out ofthe path of the shoulder onthe tripping 1 pin so as not tov interfere withthe movement 4of the'.-V

latter. 4When the operatory releases the pedal, the Vspring 23 returnsftherocker and.

latch-'to 'normal 'positions-.f As shown -in Fig.

8, during` this return' movement of the rocker, the inclined faceV 28 of thelatchjengages the inclined face of lthe-head orshoulder on the tripping pin, andfthis causes the latch to rock upwardly'intheopening 24:

Yuntil the stop` 29 on-ithe latch is -raised'o'ut Y*ofi engagement with the-lip 32. The continued ymovementl of`v the rockerpresses the cam face of the'latchV against' thefshoulderV pin and the end ofthegrooveintheiclutch member which the pin normally rests against, there might be atendencv for the Vclutch member, when coming to a stop j.

against the pin, to Vi-orce'the pin outward from the groove and thus cause a second operation of the clutchwith vone depression ofthe treadle.

pin, through wear, or otherwise. j

It will-be seenfth'at the inventionV provides against premature release of'the tripping pin during the tripping Vmovement ofthe latch, by causing4 Vthe latter to `be llocked during the tripping movement,v also,` that provision is made for preventing accidental in the ticulark type. the teeth will preferably have-.their meeting VvThe projection V33 on the 'Y in order to prevent. such vaccidental dislodgment' of the 115 dislodgment of'theltrippingpin-when withf grooveand= also, the arrangement of ythe groove is such thatthere is no possibility faces cut spirally, 'although.shownlstraight 1130 and the cam in the groove will also be cut spirally parallel with the faces of the teeth.

What I claim is;

1. The combination with a clutch and a tripping device normally engaging one member thereof, said device having a shoulder, of a rocker pivotally mounted adjacent the tripping device, a latch in slldmg engagement with said rocker for engaglng sald shoulder and tripping said device, and means for locking said latch against sl1d ing movement during the tripping movement of the rocker.

2. The combination with a clutch and a tripping pin normally engaging one member thereof, said pin having a conical head, of a rocker pivoted adjacent the pin, and a latch sliding in the rocker and adapted to engage the head of the pin.

3. The combination with a clutch and a tripping device normally engaging one member thereof, said device having a shoulder, of means for operating the trlpping device comprising a rocker, a latch carried thereby. and adapted to engage said shoulder, said latch and rocker having parts adapted to interlock and prevent backward movement of the latch during the tripping movement of the rocker.

4. The combination with a clutch, and a tripping device normally engaging one me ber thereof, said device having a shoulder, of a rocker, a latch in sliding engagement with the rocker and adapted to slip past the shoulder during one movement of the rocker and to positively engage the shoulder during the opposite movement of the rocker, said latch and rocker having parts adapted to interlock during the latter movement.

5. The combination with a clutch and a tripping device normally engaging one member thereof, said device having a shoulder, of a rocker having a slot, a spring latch movable longitudinally and laterally in the slot r by engagement with said shoulder as the rocker is moved, said latch having a part adapted to interlock with the rocker to prevent sliding movement of the latch in one of its lateral positions, and to become unlocked in its opposite lateral position to permit sliding movement of the latch.

6. The combination with a clutch and a tripping device normally engaging one member thereof, said device having a shoulder, of a rocker having a part adapted to project over the shoulder, and a latch carried by the rocker and adapted to project under the shoulder, said latch adapted to positively engage the shoulder during the tripping movement of the rocker and to slip past the shoulder during the return movement of the rocker.

7. A clutch comprising a member havin an annular groove with a cam portion a jacent one end, the latter end portion extending a short distance beyond the cam, in combination with a tripping device normally engaging said latter end, and means for tripping said device.

8. A clutch comprising a member having an annular groove with a cam portion adjacent one end, the latter end being offset in a direction away from the engaging face of said member, in combination with a tripping device normally engaging said latter end, and means for tripping said device.

9. A clutch comprising a member having an annular groove with a cam portion adjacent one end, said latter end portion eX- tending a short distance substantially parallel with the engaging face of the member and terminating in a part offset in a direction away from said face, in combination with a tripping device normally engaging said latter end, and means for tripping said device.

In testimony whereof I have afliXed my signature.

LOUIS R. GINDRAT.

Copies of this patent may be obtained tor ave cents each, by addressing the Commissioner of Patent., Washington, D. 0. 

